xref: /freebsd/contrib/kyua/m4/getopt.m4 (revision cab6a39d7b343596a5823e65c0f7b426551ec22d) 
1dnl Copyright 2010 The Kyua Authors.
2dnl All rights reserved.
3dnl
4dnl Redistribution and use in source and binary forms, with or without
5dnl modification, are permitted provided that the following conditions are
6dnl met:
7dnl
8dnl * Redistributions of source code must retain the above copyright
9dnl   notice, this list of conditions and the following disclaimer.
10dnl * Redistributions in binary form must reproduce the above copyright
11dnl   notice, this list of conditions and the following disclaimer in the
12dnl   documentation and/or other materials provided with the distribution.
13dnl * Neither the name of Google Inc. nor the names of its contributors
14dnl   may be used to endorse or promote products derived from this software
15dnl   without specific prior written permission.
16dnl
17dnl THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18dnl "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19dnl LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20dnl A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21dnl OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22dnl SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23dnl LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24dnl DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25dnl THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26dnl (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27dnl OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
29
30dnl Checks if getopt(3) supports a + sign to enforce POSIX correctness.
31dnl
32dnl In the GNU implementation of getopt(3), we need to pass a + sign at
33dnl the beginning of the options string to request POSIX behavior.
34dnl
35dnl Defines HAVE_GETOPT_GNU if a + sign is supported.
36AC_DEFUN([_KYUA_GETOPT_GNU], [
37    AC_CACHE_CHECK(
38        [whether getopt allows a + sign for POSIX behavior optreset],
39        [kyua_cv_getopt_gnu], [
40        AC_RUN_IFELSE([AC_LANG_PROGRAM([#include <stdlib.h>
41#include <string.h>
42#include <unistd.h>], [
43    int argc = 4;
44    char* argv@<:@5@:>@ = {
45        strdup("conftest"),
46        strdup("-+"),
47        strdup("-a"),
48        strdup("bar"),
49        NULL
50    };
51    int ch;
52    int seen_a = 0, seen_plus = 0;
53
54    while ((ch = getopt(argc, argv, "+a:")) != -1) {
55        switch (ch) {
56        case 'a':
57            seen_a = 1;
58            break;
59
60        case '+':
61            seen_plus = 1;
62            break;
63
64        case '?':
65        default:
66            ;
67        }
68    }
69
70    return (seen_a && !seen_plus) ? EXIT_SUCCESS : EXIT_FAILURE;
71])],
72        [kyua_cv_getopt_gnu=yes],
73        [kyua_cv_getopt_gnu=no])
74    ])
75    if test "${kyua_cv_getopt_gnu}" = yes; then
76        AC_DEFINE([HAVE_GETOPT_GNU], [1],
77                   [Define to 1 if getopt allows a + sign for POSIX behavior])
78    fi
79])
80
81dnl Checks if optreset exists to reset the processing of getopt(3) options.
82dnl
83dnl getopt(3) has an optreset global variable to reset internal state
84dnl before calling getopt(3) again.  However, optreset is not standard and
85dnl is only present in the BSD versions of getopt(3).
86dnl
87dnl Defines HAVE_GETOPT_WITH_OPTRESET if optreset exists.
88AC_DEFUN([_KYUA_GETOPT_WITH_OPTRESET], [
89    AC_CACHE_CHECK(
90        [whether getopt has optreset],
91        [kyua_cv_getopt_optreset], [
92        AC_COMPILE_IFELSE([AC_LANG_SOURCE([
93#include <stdlib.h>
94#include <unistd.h>
95
96int
97main(void)
98{
99    optreset = 1;
100    return EXIT_SUCCESS;
101}
102])],
103        [kyua_cv_getopt_optreset=yes],
104        [kyua_cv_getopt_optreset=no])
105    ])
106    if test "${kyua_cv_getopt_optreset}" = yes; then
107        AC_DEFINE([HAVE_GETOPT_WITH_OPTRESET], [1],
108                  [Define to 1 if getopt has optreset])
109    fi
110])
111
112
113dnl Checks the value to pass to optind to reset getopt(3) processing.
114dnl
115dnl The standard value to pass to optind to reset the processing of command
116dnl lines with getopt(3) is 1.  However, the GNU extensions to getopt_long(3)
117dnl are not properly reset unless optind is set to 0, causing crashes later
118dnl on and incorrect option processing behavior.
119dnl
120dnl Sets the GETOPT_OPTIND_RESET_VALUE macro to the integer value that has to
121dnl be passed to optind to reset option processing.
122AC_DEFUN([_KYUA_GETOPT_OPTIND_RESET_VALUE], [
123    AC_CACHE_CHECK(
124        [for the optind value to reset getopt processing],
125        [kyua_cv_getopt_optind_reset_value], [
126        AC_RUN_IFELSE([AC_LANG_SOURCE([
127#include <stdlib.h>
128#include <string.h>
129#include <unistd.h>
130
131static void
132first_pass(void)
133{
134    int argc, ch, flag;
135    char* argv@<:@5@:>@;
136
137    argc = 4;
138    argv@<:@0@:>@ = strdup("progname");
139    argv@<:@1@:>@ = strdup("-a");
140    argv@<:@2@:>@ = strdup("foo");
141    argv@<:@3@:>@ = strdup("bar");
142    argv@<:@4@:>@ = NULL;
143
144    flag = 0;
145    while ((ch = getopt(argc, argv, "+:a")) != -1) {
146        switch (ch) {
147        case 'a':
148            flag = 1;
149            break;
150        default:
151            break;
152        }
153    }
154    if (!flag) {
155        exit(EXIT_FAILURE);
156    }
157}
158
159static void
160second_pass(void)
161{
162    int argc, ch, flag;
163    char* argv@<:@5@:>@;
164
165    argc = 4;
166    argv@<:@0@:>@ = strdup("progname");
167    argv@<:@1@:>@ = strdup("-b");
168    argv@<:@2@:>@ = strdup("foo");
169    argv@<:@3@:>@ = strdup("bar");
170    argv@<:@4@:>@ = NULL;
171
172    flag = 0;
173    while ((ch = getopt(argc, argv, "b")) != -1) {
174        switch (ch) {
175        case 'b':
176            flag = 1;
177            break;
178        default:
179            break;
180        }
181    }
182    if (!flag) {
183        exit(EXIT_FAILURE);
184    }
185}
186
187int
188main(void)
189{
190    /* We do two passes in two different functions to prevent the reuse of
191     * variables and, specially, to force the use of two different argument
192     * vectors. */
193    first_pass();
194    optind = 0;
195    second_pass();
196    return EXIT_SUCCESS;
197}
198])],
199        [kyua_cv_getopt_optind_reset_value=0],
200        [kyua_cv_getopt_optind_reset_value=1])
201    ])
202    AC_DEFINE_UNQUOTED([GETOPT_OPTIND_RESET_VALUE],
203        [${kyua_cv_getopt_optind_reset_value}],
204        [Define to the optind value to reset getopt processing])
205])
206
207
208dnl Wrapper macro to detect all getopt(3) necessary features.
209AC_DEFUN([KYUA_GETOPT], [
210    _KYUA_GETOPT_GNU
211    _KYUA_GETOPT_OPTIND_RESET_VALUE
212    _KYUA_GETOPT_WITH_OPTRESET
213])
214